Take note that we were here on a Sunday, in Tanjong Pagar, where it is almost like an abandoned city (TP is mostly an office area, so it looks dead on weekends).

There were 4 groups seated when we reached.
Sticking to Burpple Beyond, we ordered 2 mains and settled down.
It was shocking that we waited for almost an hour (estimated to be about 50+ minutes), gave up and told them we were leaving (they were slightly embarrassed and apologetic that it took so long), STEPPED OUT, only for the lady boss to come out and said our order was "ready".
Out of politeness, we went back and began the meal.

Take note: no other tables had any main course served the whole time we were there, they all either had Borscht or the dumplings. So they either were just there for small bites & drinks or were waiting longer than us.

Our order: Rosti (with smoked salmon) and a chicken dish.
Both of them did not seem like they would really need that long to cook up.

Opinion of the food: both dishes had underwhelming serving sizes. We felt that if the food was good and serving sizes were large, maybe the wait could be forgiven, but while taste and quality might make the cut, serving sizes were disappointing.
The rosti (which again we emphasis, was nothing so special for it to need 1 hour) was average. 3 circles of potatoes, topped with salmon, and plated with an assortment of vegetables (some salad leaves, sliced onions, sliced radish). Nothing mind-blowing, rosti was unnecessarily oily.
Chicken was well seasoned, served with multiple grilled vegetables below (slices of capsicum in the 3 colours, broccoli, cauliflower, mushrooms). But it was half of a small bird, so the portion is once again very weak, maybe even scoring a big F for fail.

The lady boss did offer a slice of cake as complimentary dessert, and we appreciate the gesture, but it could not stand out to even mount an attempt at saving the day.

Overall, a lacklustre experience, we give it a 1 out of 5, and even question ourselves if that was too kind.
The wait was an absolute killer, it really should not take that long. The food hardly justified the waiting time.
Once can only imagine that without Burpple Beyond, how disappointing of an experience it would have been...

LAST MINUTE ADDITION:
We saw a reasonably big order being prepped for delivery and we feel that they are overestimating their capability to cope. If you in house diners cannot get their food, external customers really should not be a target market.
FURTHER ADDITION:
We might be reading it wrong, but the staff seemed to have displayed a degree of passive aggression after we sat back down. And that could be another unsatisfactory point to note.